RiverFish

Roach · Rutilus rutilus

Roach in the River Old Windsor

Largest measured roach: 17.4 cm

The largest roach measured in Environment Agency surveys of the River Old Windsor was 17.4 cm, recorded at Old Windsor Downstream Fry on 20 September 2006.

Across 1,872 measured roach, the median measured length was 4.2 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Old Windsor.

See roach records across England →

Most recent observation3 September 2025Old Windsor Upstream Fry · 32 fish
Largest measured roach
17.4 cm
Median length
4.2 cm
Fish measured
1,872
Survey locations
2

Individual EA measurements

Largest measured roach

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
17.4 cm20 Sept 2006Old Windsor Downstream Fry111934
17.2 cm20 Sept 2006Old Windsor Downstream Fry111934
16 cm20 Sept 2006Old Windsor Downstream Fry111934
15.8 cm20 Sept 2006Old Windsor Downstream Fry111934
15.7 cm20 Sept 2006Old Windsor Downstream Fry111934
15.5 cm20 Sept 2006Old Windsor Downstream Fry111934
15.4 cm20 Sept 2006Old Windsor Downstream Fry111934
15.4 cm20 Sept 2006Old Windsor Downstream Fry111934
14.6 cm20 Sept 2006Old Windsor Downstream Fry111934
14.6 cm20 Sept 2006Old Windsor Downstream Fry111934

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where roach were found

Each point marks a survey location with at least one roach record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding roach
Old Windsor Upstream Fry9 Sept 20043 Sept 202514
Old Windsor Downstream Fry9 Sept 20043 Sept 202517

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2004–2025

Survey records by year

Each bar shows how many survey visits recorded roach that year.

Fish measured by surveyors

Measured length distribution

See how the 1,872 measured fish were spread across different length ranges.

Smallest
2.1 cm
Lower quarter
3.6 cm
Median
4.2 cm
Upper quarter
4.9 cm
Largest
17.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Old Windsor

Compare other species with enough survey and measurement data for a detailed page.

Dace Gudgeon Chub Minnow Bleak 3-spined stickleback

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →